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High-temperature-corrosion-resistant enamel coating and preparation method thereof

A technology of high-temperature corrosion resistance and enamel, which is applied in the field of high-temperature corrosion-resistant enamel coatings and its preparation, can solve problems such as cracked enamel, enamel coating peeling, and incomplete matching of thermal expansion coefficients, so as to improve thermal shock resistance and hardness. and toughness, the effect of hindering gas migration

Active Publication Date: 2021-07-23
深圳优易材料科技有限公司
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] The enamel coating is mainly composed of a silicon-oxygen tetrahedral structure, and a glass network structure is formed by adding other tetravalent and trivalent plasmas in the gaps of the silicon-oxygen tetrahedron. However, there are still the following problems in the current enamel coating: (1) In a high temperature environment, a large amount of low melting point components are easy to react with Cr in the matrix, and further oxidize to generate a large amount of chromate spinel corrosion products, which greatly reduces the oxidation resistance of the enamel coating; (2) a large amount of low The melting point component is easy to break the silicon-oxygen bond in the silicon-oxygen tetrahedron, and accelerates the penetration of sulfur and chloride ions into the enamel coating to the matrix, seriously affecting the thermal corrosion resistance of the enamel coating; (3) the glass phase in the enamel coating is not Stable, does not match the thermal expansion coefficient of the substrate, resulting in large internal stress, easy to cause peeling of the enamel coating; (4) The enamel coating has low fracture toughness and is prone to brittle fracture, and the high porosity of the surface can increase wear When the crack nucleation rate is high, the corrosion factor will penetrate into the matrix and affect the thermal corrosion resistance of the enamel coating, etc.
However, because the thermal expansion coefficients of the enamel coating and the metal substrate do not completely match, the combination of the coating and the substrate is not very firm, and cracks will appear after long-term use, and the cracking is serious, and even the enamel will fall off the metal substrate in pieces.
[0006] Therefore, how to improve the high-temperature oxidation resistance, thermal corrosion resistance, thermal shock resistance and thermal shock toughness of enamel coatings through formulation and preparation technology has become the focus of technical research in the industry, and various research results have been repeatedly published in public publications. See in the newspaper, but, do not see so far the technology identical with the technical content of the present invention and close technology is disclosed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A high-temperature corrosion-resistant enamel paint, comprising the following raw materials in parts by weight:

[0037] 100 parts of enamel frit, 40 parts of silica sol, 8 parts of modified POSS, 6 parts of amino-modified rectorite, 15 parts of metal-coated hollow SiC microspheres;

[0038] The enamel frit is composed of the following raw materials in parts by weight: 58 parts of silicon dioxide, 3 parts of alumina, 10 parts of borax, 1.5 parts of nano-zirconia, 5 parts of quartz sand, 2 parts of titanium dioxide, 3 parts of sodium nitrate, zinc oxide 2 parts, calcium oxide 5 parts. The enamel frit is prepared by the following method: put all raw materials into a crucible and melt at a melting temperature of 1350° C. for 3 hours, water quench and then grind to prepare an enamel frit with a particle size of 50-100 μm;

[0039]The modified POSS is metal Mo-doped POSS, the particle diameter of the metal-coated hollow SiC microspheres is less than 20 μm, the metal is sele...

Embodiment 2

[0045] A high-temperature corrosion-resistant enamel paint, comprising the following raw materials in parts by weight:

[0046] 100 parts of enamel frit, 35 parts of silica sol, 7 parts of modified POSS, 4 parts of amino-modified rectorite, 10 parts of metal-coated hollow SiC microspheres;

[0047] The enamel frit is composed of the following raw materials in parts by weight: 48 parts of silicon dioxide, 4 parts of alumina, 6 parts of borax, 0.5 part of nano-zirconia, 4 parts of quartz sand, 2 parts of titanium dioxide, 2 parts of sodium nitrate, zinc oxide 4 parts, calcium oxide 6 parts.

[0048] The enamel frit is prepared by the following method: put all raw materials into a crucible and melt at a melting temperature of 1550° C. for 2 hours, water quench and then grind to prepare an enamel frit with a particle size of 50-100 μm;

[0049] The modified POSS is metal Cr-doped POSS; the particle diameter of the metal-coated hollow SiC microspheres is less than 20 μm, the metal...

Embodiment 3

[0055] A high-temperature corrosion-resistant enamel paint, comprising the following raw materials in parts by weight:

[0056] 100 parts of enamel frit, 30 parts of silica sol, 9 parts of modified POSS, 4 parts of amino-modified rectorite, 12 parts of metal-coated hollow SiC microspheres;

[0057] The enamel frit is composed of the following raw materials in parts by weight: 50 parts of silicon dioxide, 4 parts of alumina, 6 parts of borax, 1.2 parts of nano-zirconia, 6 parts of quartz sand, 5 parts of titanium dioxide, 1 part of sodium nitrate, zinc oxide 3 parts, calcium oxide 5 parts.

[0058] The enamel frit is prepared by the following method: put all raw materials into a crucible and melt at a melting temperature of 1450° C. for 3 hours, water quench and then grind to prepare an enamel frit with a particle size of 50-100 μm;

[0059] The modified POSS is metal Zn-doped POSS, the particle diameter of the metal-coated hollow SiC microspheres is less than 20 μm, the metal...

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Abstract

The invention provides a high-temperature-corrosion-resistant enamel coating and a preparation method thereof, the high-temperature-corrosion-resistant enamel coating is prepared by taking silicon dioxide and aluminum oxide as matrix agents, adding borax, quartz sand, nano zirconium oxide and the like to prepare enamel frits, and further adding silica sol, modified POSS, metal-coated hollow SiC microspheres and modified rectorite, by adjusting the preparation method and the sintering process of the enamel coating and adjusting the sintering temperature, the sintering time and the coating thickness, the enamel coating which is low in porosity and excellent in high-temperature oxidation resistance, heat corrosion resistance, thermal shock resistance and thermal shock resistance toughness is obtained, the use requirement of the waste incineration power generation boiler can be met, and the industrial application prospect is great.

Description

technical field [0001] The invention belongs to the technical field of high temperature resistant anticorrosion coatings, in particular to a high temperature corrosion resistant enamel coating and a preparation method thereof. Background technique [0002] Waste incineration power generation has the advantages of reduction, harmlessness, and resource utilization. It is recognized as the best way to dispose of waste. It has small footprint, easy site selection, short processing time, significant reduction, thorough harmlessness, and recyclability. Waste incineration waste heat and other advantages are the waste disposal methods that our country is vigorously promoting. However, the types of garbage are complex, and the flue gas formed by incineration contains a large amount of corrosive gases (such as SO2, SO3, Cl2, etc.), which will cause serious corrosion to the inside of the incineration boiler, resulting in frequent shutdowns for maintenance and major economic losses. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C8/04C03C8/14C23D5/02
CPCC03C8/04C03C8/14C23D5/02Y02E20/12
Inventor 戴雷
Owner 深圳优易材料科技有限公司
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